Top 10 Glass Windows and Doors Manufacturers in China

Quick Answer

China has one of the world's most developed supply chains for aluminum-framed glass windows and doors, particularly around manufacturing clusters such as Guangdong.

However, the right manufacturer depends heavily on the project.

A distributor buying standardized aluminum windows has very different requirements from a contractor ordering custom-sized tilt-and-turn windows for a European residential development or a developer sourcing large sliding glass doors for luxury villas.

For B2B buyers, the most important factors are not simply factory size or price. The manufacturer should be evaluated according to its ability to handle:

glass windows and glass doors as complete systems;

thermal-break and non-thermal-break aluminum frames;

custom dimensions and architectural drawings;

double and triple glazing;

tempered, laminated and Low-E glass;

different opening systems;

local certification and performance requirements;

project packaging and international shipping;

technical support before and after production.

Based on these criteria, this guide identifies ten Chinese manufacturers worth evaluating for international glass window and door projects.

The list is an editorial procurement shortlist rather than an official industry ranking. Buyers should still compare technical specifications, samples, certifications, shop drawings and project references before placing an order.

Last Updated: September 2026

[Note on This List]

This article was written and published by the Deslano operations team. As a manufacturer of doors and windows, Deslano is also one of the ten companies featured in this selection. We believe it is important to state this upfront rather than pretending this is an "independent third-party list."

Selection Criteria:

This list is compiled based on public information and industry observations across the following dimensions:

- Breadth of product line coverage (completeness of door, window, and glazing systems)

- Customization capabilities showcased on official websites or public channels

- Maturity of aluminum profiles and thermal break systems

- Export market reach (based on public information)

- Variety of glass configuration options

Limitations:

- Rankings are primarily based on public information rather than on-site factory visits or third-party audits.

- As one of the featured manufacturers, we may have an unavoidable bias in how information is presented; we recommend using this article as a preliminary screening tool rather than the sole basis for a final decision.

- Before entering into a partnership, we strongly recommend independently verifying each manufacturer's qualifications, samples, test reports, and project case studies (the "Red Flags" section at the end offers advice on how to do this).

We have placed Deslano at the top of the list due to our extensive product range and ability to support the entire process from blueprints to export-however, we encourage you to evaluate the other nine manufacturers just as seriously, rather than focusing solely on the ranking position

Introduction

China manufactures an enormous range of windows and doors, from low-cost residential products to highly engineered architectural systems.

For overseas buyers, this large supplier base creates both opportunities and challenges.

Search for a "glass window manufacturer in China" and hundreds of suppliers may appear. Yet many companies focus on only one part of the supply chain. Some manufacture glass but not complete window systems. Others manufacture aluminum profiles but outsource the finished windows. Some primarily serve standardized domestic residential projects and have limited experience handling international drawings, custom glazing or overseas building standards.

For contractors, architects, developers and distributors, the better approach is to evaluate complete window and door manufacturers capable of coordinating the frame, glass, hardware, sealing system and opening mechanism as one integrated product.

In this guide, we focus particularly on five procurement factors:

Glass Windows: Casement, sliding, fixed, awning, hung, tilt-and-turn and other window configurations.

Glass Doors: Sliding, folding, hinged, French, pivot and large-panel patio door systems.

Aluminum Frames: Standard aluminum, thermal-break aluminum and slim-frame architectural systems.

Custom Sizes: Manufacturing according to project drawings rather than relying only on standard catalog dimensions.

Glass Options: Tempered, laminated, insulated, Low-E, tinted, frosted, double-glazed and triple-glazed configurations.

We also explain which manufacturers are better suited to different project categories.

Rank	Manufacturer	Main Strength	Aluminum Frames	Custom Sizes	Glass Options	Best for	Reference for Price Positioning
1	Deslano	Project customization and broad product range	Yes	Strong	Extensive	Villas, developments, contractors, distributors	Mid-to-high-end
2	DERCHI	High-end aluminum systems	Yes	Strong	Extensive	Luxury residential and architectural projects	High-end
3	EEHE	Large-scale system manufacturing	Yes	Strong	Extensive	Developers and larger commercial projects	Mid-to-high-end
4	SAYYAS	Premium aluminum-clad wood systems	Aluminum-clad wood	Yes	Project-specific	High-performance residential projects	High-end (specializing in aluminum-clad wood)
5	Doorwin	Export-oriented project customization	Yes	Strong	Extensive	North American and custom projects	Mid-to-high-end
6	WANJIA	Broad aluminum and uPVC range	Yes	Strong	Double/triple glazing	Residential and distribution projects	Mid-range
7	Rogenilan	Mid/high-end aluminum systems	Yes	Strong	Multiple glazing options	Villas, apartments and hotels	Mid-to-high-end
8	BORN	Drawing-based architectural customization	Yes	Strong	Double, triple, Low-E	Design-led projects	Mid-to-high-end
9	NEWLINE	Flexible full customization	Yes	Strong	Extensive	Small-to-medium custom orders	Mid-range (flexible with small orders)
10	Joy Shing Glass	Strong glass-processing capability	Yes	Strong	Very extensive	Glass-intensive architectural projects	Depends on glass specifications

Guangdong Deslano Doors and Windows Co., Ltd. is a China-based manufacturer focused on complete glass window and door systems for international residential and commercial projects.

Its product portfolio covers sliding windows, casement windows, folding windows, fixed windows, single- and double-hung windows, tilt-and-turn windows, sliding glass doors, hinged glass doors, pocket doors, folding glass doors, French doors, curtain wall systems and other architectural glazing products.

This wide product range makes Deslano particularly suitable for projects where multiple window and door types must be purchased from one supplier rather than coordinating several separate factories.

Glass Windows

Available window directions include:

casement windows;

sliding windows;

fixed windows;

tilt-and-turn windows;

single- and double-hung windows;

folding windows;

lifting windows;

large fixed glazing.

This makes the manufacturer suitable for both European-style opening systems and North American or international residential projects.

Glass Doors

Door systems include:

sliding glass doors;

folding glass doors;

hinged glass doors;

French doors;

pocket glass doors;

large panoramic patio doors;

entrance doors.

Large sliding and folding systems can also be combined with fixed sidelights or transoms for wide architectural openings.

Deslano supplies aluminum window and door systems including thermal-break configurations.

Its manufacturing process includes profile cutting, thermal-break processing, lock milling, glass assembly, profile assembly, sealing and product testing.

Frame finish, color, system depth and hardware can be selected according to the project.

Customization is one of the manufacturer's strongest points.

Products can be manufactured according to architectural drawings, door and window schedules or confirmed opening dimensions rather than being limited to standard sizes.

The company states that OEM/ODM customization can cover dimensions, style, finish and additional product features.

This is particularly useful for renovation projects, villas and developments where every opening may have a different size.

Glass Options

Depending on the selected system, buyers can configure:

tempered glass;

laminated safety glass;

double glazing;

triple glazing;

Low-E glass;

argon-filled insulated glass;

tinted glass;

privacy glass;

different glass thickness combinations.

Glass configuration should be selected according to thermal performance, safety, sound insulation, solar control and local building-code requirements.

Deslano is particularly suitable for:

Custom villas: Multiple window and door styles can be coordinated within the same architectural design.

Residential developments: Repeated units can be standardized while special openings remain customized.

Hotels and resorts: Large sliding glass doors, folding systems and panoramic glazing work well for guestrooms, restaurants and public areas.

Contractor projects: Drawing review, custom manufacturing and packaging can be coordinated according to project schedules.

Distributors: A broad product portfolio allows buyers to source several window and door categories through one factory.

Architectural projects: Custom dimensions, glass configurations and aluminum finishes provide greater design flexibility.

Deslano's website states that its manufacturing operations cover more than 20,000 m² and that customized production, project support and export preparation are part of its manufacturing model.(Source: Deslano's Company website and publicly available information; verified as of September 2026. Please refer to the latest documentation provided by the manufacturer for specific production capacity, certifications, and product specifications.)

DERCHI is a Foshan-based manufacturer specializing in aluminum alloy windows and doors for wholesale and international projects.

The company positions itself around high-end aluminum window and door manufacturing and states that its team has more than 25 years of industry experience.

Its product range makes it particularly relevant for buyers looking for modern architectural aluminum systems rather than basic commodity windows.

Glass Windows

The manufacturer offers products such as:

casement windows;

tilt-and-turn windows;

sliding windows;

fixed windows;

custom house windows.

Large glass areas and modern profile designs are frequently used across its product lines.

Glass Doors

Typical systems include:

aluminum sliding doors;

bifold doors;

patio doors;

entrance doors;

large architectural glass door systems.

DERCHI products are therefore well suited to contemporary villas and indoor-outdoor living applications.

Aluminum framing is one of the company's primary specialties.

Thermal-break frame configurations are available for projects requiring improved insulation and energy performance.

The company promotes complete project customization and states that window and door systems can be developed around customer design requirements.

This makes DERCHI better suited to project orders than buyers looking only for basic standardized stock windows.

Depending on the system, configurations can include insulated glazing, double glazing and Low-E glazing. Product listings also show double-tempered and energy-efficient glazing configurations.

DERCHI is worth considering for:

luxury villas;

premium residential developments;

large patio openings;

high-end renovation;

architects requiring modern aluminum systems;

North American and international residential projects.

(Source: Company website and publicly available information; verified as of September 2026. Please refer to the latest documentation provided by the manufacturer for specific production capacity, certifications, and product specifications.)

EEHE is an established Foshan manufacturer specializing in aluminum windows and doors.

Its product range includes aluminum casement, folding, hung and sliding windows as well as sliding, folding and swing doors, sunrooms, entrance doors and glass-related architectural products.

The company has a significantly larger industrial structure than many small export-oriented factories, making it relevant for buyers evaluating production capacity and system engineering.

Glass Windows

Its window portfolio covers:

casement windows;

tilt-and-turn windows;

sliding windows;

hung windows;

folding windows;

awning windows;

skylights.

Glass Doors

Available systems include:

sliding glass doors;

lift-and-slide doors;

folding doors;

French-style doors;

swing doors;

entrance doors.

EEHE primarily focuses on aluminum window and door systems and offers thermal-break configurations.

Heavy-duty aluminum frames are available for larger sliding door applications.

The manufacturer provides project-based customized window and door solutions and positions its R&D and technical support around residential, commercial and architectural projects.

Examples in its current product range include:

double glazing;

triple glazing;

laminated glass;

Low-E glass;

tempered glass;

insulated glass;

argon-filled configurations.

Its products are marketed with certifications covering several international markets, although buyers should always request the exact test report applicable to the system being quoted.

EEHE is particularly relevant for:

large residential developments;

villa projects;

hotels;

commercial developments;

distributors requiring broad product coverage;

projects requiring documented performance standards.

SAYYAS was founded in 1998 and specializes in aluminum-wood window technology.

The company states that it introduced German-style aluminum-wood window systems into China and exports products to markets including Canada, the United States, Australia, New Zealand, Japan and South Korea.

Unlike many suppliers in this list, SAYYAS is more specialized.

Its core strength is not low-cost aluminum windows or a massive range of glass doors. Instead, it focuses on premium aluminum-clad wood fenestration.

Glass Windows

Its products are particularly relevant where buyers want the natural appearance of timber internally while maintaining weather-resistant aluminum protection externally.

The construction differs from a conventional all-aluminum window.

An external aluminum cladding protects the timber frame while the wood remains visible on the interior.

Architectural window projects can be configured according to project dimensions and building requirements.

Glass packages should be confirmed according to the selected SAYYAS system and required thermal-performance target.

For high-performance construction, insulated glazing is normally evaluated together with the frame rather than selected independently.

SAYYAS is most relevant for:

premium villas;

luxury residential developments;

high-performance homes;

architects specifying natural timber interiors;

projects where aluminum-clad wood is preferred over conventional aluminum.

It is less appropriate for buyers whose priority is simply finding the lowest-cost aluminum glass door factory.(Source: Company website and publicly available information; verified as of September 2026. Please refer to the latest documentation provided by the manufacturer for specific production capacity, certifications, and product specifications.)

Beijing Doorwin Construction Co., Ltd. is an export-oriented supplier focused on custom windows and doors.

Current supplier information shows customization options involving double glazing, triple glazing, tempered glass, argon-filled glazing, size, frame configurations, hardware, drawings and various opening systems.

This makes the company particularly relevant to overseas residential and construction buyers.

Glass Windows

Typical products include:

casement windows;

fixed windows;

hung windows;

custom shaped windows;

energy-efficient windows.

Glass Doors

Its range includes:

sliding doors;

lift-and-slide doors;

bifolding doors;

hinged doors;

custom entrance systems.

Aluminum and aluminum-related architectural frame configurations are available, alongside other material systems.

Doorwin is strongly oriented toward blueprint and drawing-based customization.

This is useful when the buyer has a detailed window schedule instead of a simple list of standard window dimensions.

Glass Options

Available project directions include:

double glazing;

triple glazing;

tempered glass;

argon-filled insulated glazing;

energy-efficient glass packages.

Doorwin is worth evaluating for:

North American residential construction;

luxury homes;

custom architectural projects;

large sliding door openings;

contractors working from architectural drawings.

Foshan WANJIA Window and Door manufactures aluminum and uPVC window and door products and supports customized dimensions.

Its current product range includes aluminum windows, aluminum doors, PVC/uPVC windows and doors, curtain wall systems and related architectural products.

Glass Windows

Product categories include:

aluminum casement windows;

aluminum sliding windows;

uPVC casement windows;

uPVC sliding windows;

customized residential window systems.

Glass Doors

The manufacturer supplies:

aluminum sliding doors;

folding doors;

swing doors;

uPVC doors;

large residential openings.

Standard and thermal-break aluminum configurations are available depending on the product series.

WANJIA publicly promotes windows and doors manufactured according to customer measurements rather than only standard dimensions.

Its current information references:

double glazing;

triple glazing;

Low-E glazing;

insulated glass;

customized glass options.

WANJIA is a practical candidate for:

residential buildings;

villas;

importers requiring aluminum and uPVC from one supplier;

distributors;

standardized developments with some custom openings;

replacement-window projects.

Foshan Rogenilan Windows and Doors System Co., Ltd. focuses primarily on middle- and high-end aluminum window and door systems.

The manufacturer lists applications including apartments, villas, hotels and commercial projects and reports exports to Australia, North America, Europe, Southeast Asia, the Middle East and Africa.

Glass Windows

Its product range includes:

casement windows;

sliding windows;

tilt-and-turn systems;

pivoting windows;

fixed and combined glazing;

custom architectural window shapes.

Glass Doors

Available systems include:

sliding glass doors;

folding doors;

terrace doors;

interior aluminum glass doors;

large-opening systems.

Aluminum is the manufacturer's primary frame material, including thermal-break systems.

Rogenilan supports OEM and ODM production and supplies customized sizes and configurations for different building projects.

Product offerings include double-glazed and triple-glazed configurations as well as sound-insulation and impact-oriented glass systems.

The company is particularly suitable for:

villas;

apartments;

hotels;

residential developments;

buyers seeking mid- to-high-end aluminum systems;

export projects requiring several window styles.

BORN takes a strongly project-oriented approach to window and door manufacturing.

Its published customization process starts from architectural drawings, opening sizes and confirmed configurations rather than forcing projects into fixed catalog dimensions.

Glass Windows

Its catalog includes:

casement windows;

sliding windows;

awning windows;

hopper windows;

folding windows;

panoramic windows;

other architectural systems.

Glass Doors

Door products include:

sliding doors;

folding doors;

casement doors;

entrance doors;

interior glass doors.

BORN offers aluminum systems incorporating thermal-break structures and architectural framing details.

This is one of BORN's strongest characteristics.

The company explicitly states that dimensions can be manufactured according to reviewed project drawings.

Panel arrangements can also be customized using fixed panels, opening sections, sidelights and transoms.

Glass Options

Published options include:

double glazing;

triple glazing;

Low-E glass;

insulated tempered glass.

BORN is particularly relevant for:

architects;

luxury villas;

hotels;

residential developments;

commercial buildings;

projects with complex window schedules;

buyers emphasizing drawing coordination.

NEWLINE Building Materials offers aluminum windows, aluminum doors, glass doors, garage doors and related products for overseas buyers.

The company supports extensive customization of frame size, glass type, profile thickness, surface treatment and opening direction.

Glass Windows

Products include aluminum sliding and other residential window configurations.

Glass Doors

Sliding glass doors and folding glass doors are particularly relevant within its range.

Both normal aluminum and thermal-break aluminum profiles are available.

Depending on the system, profile thicknesses can also be customized.

Sizes can be manufactured according to buyer requirements.

This makes NEWLINE useful for smaller custom projects where standard catalog dimensions do not match the site.

Glass Options

The manufacturer offers one of the more clearly documented glass menus in this shortlist:

clear glass;

tempered glass;

laminated glass;

tinted glass;

Low-E glass;

frosted glass;

single glazing;

double glazing;

triple glazing.

Representative insulated glass configurations include 5+9A+5 mm, 5+12A+5 mm and 6+12A+6 mm, while triple glazing can also be configured.

NEWLINE is worth considering for:

villas;

residential renovations;

small commercial buildings;

hotel projects;

customized patio doors;

buyers requiring flexible glass specifications.

Joy Shing differs from many companies in this list because its core expertise is strongly connected to architectural glass processing.

The company supplies tempered, laminated, insulated and specialty glass and also promotes complete aluminum glass window and door solutions.

This can be an advantage when the glazing itself is a major technical component of the project.

Glass Windows and Doors

Joy Shing offers aluminum-framed glass windows and doors alongside architectural glass products.

Aluminum profiles and hardware are incorporated into its complete window and door solutions.

Glass can be processed according to custom dimensions and shapes, although dimensions, holes and processing requirements must normally be finalized before tempering.

Glass Options

This is the company's strongest area.

Available directions include:

tempered glass;

heat-strengthened glass;

laminated glass;

insulated glass;

Low-E glass;

safety glass;

specialty architectural glazing.

Joy Shing is particularly interesting for:

projects with unusual glass specifications;

curtain-wall-related glazing;

architectural glass doors;

commercial buildings;

projects requiring custom glass processing;

buyers who place greater emphasis on glazing than on the window brand itself.

There is no single manufacturer that is best for every buyer.

The correct supplier depends primarily on the project type, technical requirements and purchasing model.

For villas, customization is usually more important than mass-production capacity.

The project may contain twenty or thirty different window sizes together with oversized sliding doors, folding doors, entrance doors and fixed glazing.

Recommended supplier types include:

Deslano: Particularly suitable when multiple product categories need to be coordinated through one supplier.

DERCHI: Suitable for premium modern aluminum systems.

BORN: Strong option where architectural drawings and custom configurations drive the project.

Rogenilan: Suitable for conventional high-end aluminum systems.

Developers usually need consistency, repeatable specifications and controlled costs.

The ideal supplier should be capable of standardizing several window types while producing hundreds or thousands of similar units.

Manufacturers such as Deslano, EEHE, WANJIA and Rogenilan are worth comparing for this type of procurement.

The final choice should be based on production capacity, approved samples, performance reports and batch-quality control.

Hotel projects often combine several different window and door requirements:

guestroom windows;

balcony sliding doors;

folding restaurant doors;

fixed lobby glazing;

entrance doors;

interior glass doors.

For this reason, a manufacturer with a broad product portfolio is usually easier to work with than a highly specialized window-only supplier.

Deslano, EEHE, DERCHI and BORN are particularly relevant to this purchasing model.

Commercial projects generally place greater emphasis on engineering documentation, large glazing areas and coordination with architects.

Buyers should evaluate:

frame structural capacity;

maximum panel dimensions;

glass thickness;

laminated safety glass requirements;

thermal performance;

wind-load performance;

drainage;

hardware cycle ratings;

shop drawing capability.

For these applications, manufacturer selection should be based on engineering compatibility rather than price alone.

Distributors have a different set of priorities.

They usually need:

stable recurring production;

multiple systems;

predictable pricing;

flexible MOQ;

replacement parts;

custom branding;

packaging suitable for warehouse handling;

product documentation;

market-specific configurations.

Broad-range manufacturers such as Deslano, WANJIA, Rogenilan and EEHE may therefore be more suitable than highly specialized architectural suppliers.

Background:

James, a residential developer in the U.S., needed to source thermally broken aluminum windows and doors for a 30-unit townhouse project. He initially evaluated three manufacturers: A, B, and C.

Comparison Process:

- "Manufacturer A": Offered the lowest price, but could not clearly explain the specific profile wall thickness of the thermal break system during initial discussions; furthermore, they failed to respond for a week after being asked to provide test reports.

- "Manufacturer B": Offered a mid-range price and provided a comprehensive custom drawing process along with past project references; however, their product line lacked the folding door system the client required, necessitating the search for an additional supplier.

- "Manufacturer C" (Final Choice): Quoted a slightly higher price than A, but provided clear technical specifications for their thermal break system. They offered a one-stop solution covering sliding windows, folding doors, and fixed windows, and supplied both samples and test reports on the same day.

Basis for Final Decision:

The client's decision-making logic: Although the unit price wasn't the lowest, the one-stop sourcing approach saved time and coordination costs associated with managing multiple suppliers, making it more cost-effective overall.

Outcome:

- The timeline from drawing confirmation to delivery was five weeks.

- Upon delivery, James praised the excellent product quality and expressed eagerness to collaborate on larger future orders.

Advice for Similar Buyers:

"A lesson from real-world experience: Don't just compare unit prices-always request test reports and samples first. Suppliers offering the lowest prices are often vague about critical technical specifications."

Glass specification can affect the window's safety, thermal insulation, sound insulation and final price as much as the aluminum frame itself.

Buyers should therefore avoid simply writing "double glass" in a purchase order.

Tempered glass is heat-treated to improve mechanical strength and safety.

When broken, it fragments into relatively small pieces rather than large sharp shards.

It is widely used for:

glass doors;

large sliding doors;

folding doors;

floor-to-ceiling glazing;

windows requiring safety glazing.

Laminated glass consists of multiple glass layers bonded by an interlayer such as PVB.

If the glass breaks, the interlayer helps hold the fragments together.

It is commonly selected for:

safety glazing;

doors;

low-level windows;

hurricane or impact applications;

noise reduction;

security-oriented projects.

A typical double-glazed insulated glass unit consists of two glass panes separated by a sealed spacer.

Examples may include:

5 mm + 12A + 5 mm

6 mm + 12A + 6 mm.

The exact configuration depends on window dimensions and required performance.

Triple glazing uses three glass panes and two insulated cavities.

It is most relevant for:

cold climates;

high-performance homes;

Northern European projects;

passive or near-passive construction;

projects targeting low U-values.

However, triple glazing is substantially heavier than double glazing.

The frame, hinges, rollers and hardware must therefore be designed for the increased glass weight.

Low-emissivity coatings reduce heat transfer through the glazing.

Depending on coating type and orientation, Low-E glass can help improve insulation or reduce solar heat gain.

It is commonly specified for:

European residential construction;

energy-efficient homes;

hot climates;

large glass elevations;

air-conditioned buildings.

Argon can replace ordinary air inside the insulated glass cavity to reduce conductive heat transfer.

This option is frequently combined with Low-E glass in energy-efficient window systems.

Tinted or solar-control glazing may be useful for buildings exposed to strong sunlight.

Typical applications include:

hotels;

villas;

office buildings;

south- or west-facing elevations;

large sliding doors.

Privacy glazing is commonly used for:

bathrooms;

internal doors;

office partitions;

secondary residential spaces.

Two manufacturers may both quote "aluminum windows" while supplying completely different frame systems.

Before comparing prices, buyers should identify the following.

6063-series architectural aluminum is commonly used for window and door extrusion systems.

However, aluminum alloy alone does not determine window quality.

Required thickness depends on:

window dimensions;

door size;

opening method;

wind pressure;

project height;

system design.

Large sliding doors may require considerably stronger profiles than small residential windows.

A conventional aluminum profile conducts heat easily.

Thermal-break systems incorporate an insulating section between the inside and outside aluminum components.

Thermal-break frames should normally be considered for:

European projects;

cold climates;

air-conditioned buildings;

energy-efficiency requirements;

higher-performance residential construction.

Common choices include:

powder coating;

anodizing;

electrophoretic finishes;

wood-grain finishes.

For exterior applications, buyers should specify color code and coating requirements rather than simply requesting "black" or "gray."

Unlike furniture or consumer products, windows are normally part of the building envelope.

A 10 mm or 20 mm dimensional mistake can cause major installation problems.

Professional custom-window procurement should therefore begin with a window schedule.

For every opening, specify:

W × H

Quantity

Opening direction

Window or door type

Frame color

Glass specification

Hardware

Screen

Required U-value or performance

Installation detail

For complex projects, elevation drawings should also show fixed and operable panels.

The manufacturer should issue shop drawings for approval before production.

This process is particularly important for irregular, arched, oversized and multi-panel window systems.

Price should only be compared after the technical specifications are aligned.

A quotation of USD 100/m² and another quotation of USD 150/m² are not directly comparable if one uses non-thermal aluminum with basic double glazing while the other uses thermal-break profiles, Low-E insulated glass and branded multi-point hardware.

Before choosing a manufacturer, compare the following factors.

Determine whether the factory can supply the full project.

If your building requires casement windows, sliding doors, folding doors and fixed glazing, buying everything from one integrated manufacturer may simplify coordination.

Ask whether products are genuinely fabricated according to project dimensions or whether customization simply means choosing from several standard sizes.

Confirm:

glass thickness;

tempering;

lamination;

Low-E coating;

insulated glass cavity;

argon filling;

spacer type;

safety-glazing requirements.

Request:

profile section drawings;

system depth;

wall thickness;

thermal-break details;

surface-finish specifications.

Hardware can strongly influence long-term window performance.

Ask for the exact brand and model wherever possible instead of accepting a generic description such as "German hardware."

Depending on the market, request applicable documentation for:

air infiltration;

water penetration;

wind pressure;

thermal performance;

safety glazing;

relevant certification.

Certification should always be checked against the exact product system being purchased.

A factory having one certified window does not automatically mean every product in its catalog is certified.

For project procurement, the manufacturer's ability to understand architectural drawings is often more important than catalog size.

The supplier should be capable of converting project information into confirmed manufacturing drawings.

Before mass production, agree on:

approved sample;

color;

glass;

hardware;

drainage;

opening direction;

packaging;

labeling.

Pre-shipment inspection is particularly important for large projects.

International window transportation differs greatly from domestic delivery.

Large glass doors and windows should be protected against:

glass breakage;

aluminum scratches;

corner impact;

movement inside containers;

moisture.

Ask whether replacement:

handles;

hinges;

locks;

rollers;

seals;

motors;

screens

can be supplied several years after the project is completed.

Several warning signs deserve additional investigation.

A very low price may indicate changes in aluminum thickness, glass configuration, hardware or finishing.

For custom windows, manufacturing directly from a simple dimension list without drawing confirmation increases risk.

"Double glass" is not a complete technical specification.

Ask for exact hardware specifications wherever hardware quality is important.

Request the report and confirm that the tested configuration corresponds to the window being purchased.

Dimensions, drawings, glass, finish and hardware should be clearly agreed before production begins.

China's advantage is not simply lower manufacturing cost.

The country's major window-and-door manufacturing regions contain highly developed supporting industries for:

aluminum extrusion;

glass tempering;

laminated glass;

insulating glass;

powder coating;

hardware;

EPDM sealing systems;

screens;

packaging;

international logistics.

For custom architectural projects, this integrated supply chain allows a single window manufacturer to coordinate many components within one production network.

This is particularly valuable for projects requiring dozens of different sizes and configurations.

Deslano's approach is primarily project-based rather than restricted to standardized retail products.

The company's product portfolio includes glass windows, glass doors, garage doors, curtain wall systems and other aluminum-glass architectural solutions.

For overseas buyers, the typical cooperation process can include:

Buyers can provide:

architectural drawings;

window schedules;

dimensions;

reference images;

glass requirements;

local performance requirements.

Suitable systems can then be selected according to:

opening dimensions;

project climate;

design;

budget;

performance targets.

Dimensions, opening direction, panel arrangement and relevant configurations are confirmed before manufacturing.

Glass can be selected according to project needs, including safety, insulation, acoustic performance and solar control.

Profiles, glass, hardware and sealing components are assembled according to the confirmed configuration.

Finished windows and doors can be checked for dimensions, opening operation, appearance and other project requirements before packaging.

Products are protected and packed for international transportation.

Deslano works with contractors, architects, developers, homeowners, distributors and other international buyers and provides project-oriented customization rather than limiting clients to standard catalog dimensions.

If you are sourcing glass windows and doors from China, do not select the factory only according to the company name or the lowest price.

Start with your project requirements.

For a custom villa, prioritize design flexibility and mixed-product coordination.

For a large development, prioritize production consistency, documentation and capacity.

For cold-climate construction, focus on thermal-break frames, Low-E insulated glazing and verified thermal performance.

For oversized glass doors, pay particular attention to frame strength, glass weight and hardware capacity.

For distributors, consider product breadth, repeat-order consistency and spare-part availability.

Among the manufacturers reviewed in this guide, Deslano is particularly well suited to buyers requiring a broad combination of glass windows, glass doors, aluminum frames, custom dimensions and project-specific glazing through a single manufacturer.

However, the best final choice should always be made after comparing technical drawings, glass specifications, frame sections, hardware, certifications, samples and commercial terms.

Q1: Who are the best glass window and door manufacturers in China?

China has many established window and door manufacturers. Suppliers worth evaluating include Deslano, DERCHI, EEHE, SAYYAS, Doorwin, WANJIA, Rogenilan, BORN, NEWLINE and Joy Shing Glass.

The best supplier depends on whether the project requires aluminum windows, large sliding glass doors, premium aluminum-clad wood windows, custom architectural sizes or specialized glazing.

Q2: Can Chinese manufacturers make custom-size glass windows?

Yes.

Many Chinese project-oriented manufacturers fabricate windows according to architectural drawings and opening schedules rather than only offering standard dimensions.

Buyers should provide exact width, height, opening direction and configuration details before production.

Q3: What glass options are available for aluminum windows and doors?

Common options include:

tempered glass;

laminated glass;

double glazing;

triple glazing;

Low-E glass;

tinted glass;

frosted glass;

argon-filled insulated glass.

The correct configuration depends on climate, safety requirements, energy performance, sound insulation and project budget.

Q4: Are aluminum frames suitable for large glass doors?

Yes, but the aluminum profile system must be designed for the panel dimensions and glass weight.

Large sliding and folding doors generally require stronger profiles, reinforced tracks, suitable rollers and heavier-duty hardware than conventional windows.

Q5: Should I choose thermal-break aluminum frames?

Thermal-break aluminum is generally recommended when thermal insulation matters.

It is particularly useful for European buildings, colder climates, air-conditioned buildings and projects targeting improved energy performance.

Q6: Can Chinese manufacturers produce double- and triple-glazed windows?

Yes.

Double and triple glazing are widely available from project-oriented Chinese manufacturers.

However, buyers should specify the exact build-up rather than simply requesting "double glass."

Q7: What information should I send to get a window quotation?

For an accurate quotation, provide:

window and door dimensions;

quantities;

opening types;

project location;

frame material;

frame color;

glass configuration;

hardware requirements;

screens;

performance requirements;

architectural drawings if available.

Q8: How do I verify a Chinese window manufacturer?

You should review:

business information;

factory photos or video;

product samples;

technical drawings;

performance reports;

certifications;

production process;

inspection procedures;

project references.

For large orders, a factory visit or third-party inspection is recommended.

Q9: What is the difference between a glass manufacturer and a glass window manufacturer?

A glass manufacturer mainly processes glazing products such as tempered, laminated or insulated glass.

A glass window and door manufacturer combines the glass with frames, hardware, seals, drainage systems and opening mechanisms to create a complete building product.

For most construction projects, buyers need a complete window and door manufacturer rather than only a glass processor.

Q10: Which manufacturer is suitable for a project requiring many different window and door sizes?

Choose a manufacturer with strong drawing-based customization and a broad product range.

For projects combining casement windows, sliding windows, fixed glazing, sliding glass doors and folding doors, an integrated manufacturer such as Deslano can reduce coordination between multiple suppliers.

Request a Custom Glass Window and Door Proposal

Send us your project drawings, window schedule or opening dimensions.

Deslano's technical team can review the information and recommend suitable aluminum frames, glass configurations and window or door systems for your project.

Contact us for a customized window and door proposal.

Top 10 Glass Windows and Doors Manufacturers in China

Top 10 Glass Windows and Doors Manufacturers in China: Quick Comparison

1. Deslano

Best Overall for Custom Glass Window and Door Projects

Aluminum Frames

Custom Sizes

Suitable Projects

2. DERCHI

Best for Premium Aluminum Window and Door Systems

Aluminum Frames

Custom Sizes

Glass Options

Suitable Projects

3. EEHE Doors & Windows

Best for Large-Scale Aluminum Window and Door Projects

Aluminum Frames

Custom Sizes

Glass Options

Suitable Projects

4. SAYYAS Windows

Best for Premium Aluminum-Clad Wood Windows

Aluminum Frames

Custom Sizes

Glass Options

Suitable Projects

5. Doorwin

Best for Export-Oriented Custom Window Projects

Aluminum Frames

Custom Sizes

Suitable Projects

6. WANJIA Windows & Door

Best for Broad Aluminum and uPVC Product Selection

Aluminum Frames

Custom Sizes

Glass Options

Suitable Projects

7. Rogenilan

Best for Mid- to High-End Aluminum Windows and Doors

Aluminum Frames

Custom Sizes

Glass Options

Suitable Projects

8. BORN / Bowen Doors & Windows

Best for Drawing-Based Architectural Customization

Aluminum Frames

Custom Sizes

Suitable Projects

9. NEWLINE Building Materials

Best for Flexible Custom Glass Door and Window Orders

Aluminum Frames

Custom Sizes

Suitable Projects

10. Joy Shing Glass

Best for Projects Where Glass Specification Is the Priority

Aluminum Frames

Custom Sizes

Suitable Projects

Which China Glass Window and Door Manufacturer Is Best for Your Project?

Custom Villas

Residential Developments

Hotels and Resorts

Commercial Buildings

Window and Door Distributors

Real-World Sourcing Case: How a Developer Evaluated Three Manufacturers

Selecting a Supplier for Windows and Doors: A North American Residential Developer's Approach

What Glass Options Should You Request From a Chinese Window Manufacturer?

Tempered Glass

Laminated Glass

Double Glazing

Triple Glazing

Low-E Glass

Argon-Filled Insulated Glass

Tinted and Solar-Control Glass

Frosted and Privacy Glass

Aluminum Frames: What Buyers Should Compare

Aluminum Alloy

Profile Wall Thickness

Thermal-Break vs Non-Thermal-Break Aluminum

Surface Finish

Why Custom Sizes Matter When Buying Windows From China